就停在这儿了：
NMI_Handler PROC
EXPORT NMI_Handler [WEAK]
B .
ENDP
HardFault_Handler\
PROC
EXPORT HardFault_Handler [WEAK] IF SEMIHOSTED
LDR R0, [R13, #24] ; Get previous PC
LDRH R1, [R0] ; Get instruction
LDR R2, =0xBEAB ; The sepcial BKPT instruction
CMP R1, R2 ; Test if the instruction at previous PC is BKPT
BNE HardFault_Handler_Ret ; Not BKPT
ADDS R0, #4 ; Skip BKPT and next line
STR R0, [R13, #24] ; Save previous PC
BX LR
HardFault_Handler_Ret
ENDIF
B .
ENDP
SVC_Handler PROC
EXPORT SVC_Handler [WEAK]
B .
ENDP
PendSV_Handler PROC
EXPORT PendSV_Handler [WEAK]
B .
ENDP
SysTick_Handler PROC
EXPORT SysTick_Handler [WEAK]
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